package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始公共字段自动填充");

        //获取当前被拦截的数据库操作类型
   MethodSignature signature = (MethodSignature)joinPoint.getSignature();
   AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
   OperationType operationType = annotation.value();

   //获得当前被拦截的方法参数
   Object[] args = joinPoint.getArgs();
   if (args == null || args.length == 0){
       return;
   }

   Object entity= args[0];

   //准备赋值的数据
   LocalDateTime now = LocalDateTime.now();
   Long currentId = BaseContext.getCurrentId();

   //根据当前不同的操作类型，为对应的属性通过反射来赋值
   if (operationType == OperationType.INSERT) {
       //为4个公共字段赋值
       try {
           Method setCreateTime = entity.getClass().getDeclaredMethod("setCreateTime", LocalDateTime.class);
           Method setCreateUser = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);
           Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
           Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

           //通过反射来为对象的属性赋值
           setCreateTime.invoke(entity,now);
           setCreateUser.invoke(entity,currentId);
           setUpdateTime.invoke(entity,now);
           setUpdateUser.invoke(entity,currentId);
       } catch (Exception e) {
           e.printStackTrace();
       }
   } else if (operationType==OperationType.UPDATE) {
       //为两个公共字段赋值
       try {
           Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
           Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

           //通过反射来为对象的属性赋值
           setUpdateTime.invoke(entity,now);
           setUpdateUser.invoke(entity,currentId);
       } catch (Exception e) {
           e.printStackTrace();
       }

   }
    }
}
